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Description
Although I am using the standard format for explaining this effect, there are somethings you need to know which are not so easily illustrated. So the text here will cover the omissions. I will try to keep it brief.

The Sliders
Both controllers use the same type of sliders. Briefly this is what they do, but important to keep in mind that the sliders are complimentary in the sense that they effect each other as well as the effects of the other sliders but to a lesser extent.

The controllers have a huge effect on the behavior of the global lighting set up, so set this up first before tweaking with the sliders.

Also make sure you turn on: view(V) > camera lighting tracking (C).

MainLight +/- : these sliders affect the behavior of the primary global lighting. Primarily their intensity and tones.
GroundRef +/- : these sliders control the way the ground plane interacts with light cast on it. It is most noticable of the ground plane, but it actually controls the light thrown back from the ground plane on to other surfaces, primarily on the MMD model.
RimLight +/- : these sliders control how light "curves" over the edges of the MMD models. Especially useful for backlighting control or when the primary lighting is coming off the ground plane.
LightEdge + : the effect of this slider is situational. Very often you won't see any immediate apparent result. Mainly a highlighter.
AmbientEdge + : this slider controls how the light from surrounding objects interact with other objects in the vicinity. As it's name implies the visual result is most noticable around the edge of objects.

Use and Considerations
The controllers are loaded as PMD models. Their actually location in 3D space is irrelevant as the direction of their effects are controlled via MMD's global light settings.

These effects are fairly system intensive. They can really bog down a slow system.

There are two controllers:
Post OverRayVR.pmd
Post GammaLightVR.pmd

For most applications you will only need the first one. The second one is used to correct or adjust colors and tones set by the first one. According to the instructions, however, it can also be used as a light source coming from the opposite direction.

The controllers can be used by themselves to emulate the effects of other MMD shaders.

Understanding how the lighting system works in MMD and why these controllers are useful
I can only this briefly as the subject is actually quite complex. MMD's light system factors in only light from the global light source and reflects this directly to the camera. When the light hits an object it factors in the properties of its material as set by its diffuse, ambient, specular, transparency and shininess values. These can also be offset/adjusted through the use of tone, sph and spa maps. The system in place is sophisticated and primitive at the same time. So for example, you cannot have a truly luminous material without the use of an MME effect, but it does a fairly good job representing dull to shiny materials through a combination of the aforementioned.

What MMD does not do is factor in light reflected from other materials on to the object or model. This is the primary reason why MMD cannot produce photorealistic results (like Poser could for example). Software like Poser uses as system that is called Ray Tracing and in a nutshell, this allows for the program to calculate how light interacts with a model from all sources in a scene. Naturally, this is pretty system intensive and this is probably why MMD doesn't have it as it's really made for making music videos on your average home computer system.

The Post OverRay effect fills this void by virtually simulating a Ray Tracing environment, and this is one of the reasons why it works so well with other shaders as it makes up for their primary short-coming. Specifically, almost all MME shaders do not factor in light sources from any source other than the global light source.

But the Post OverRay effect also factors in the characteristics of materials in models, so once again for those who understand how the material specifications really work, in theory almost photographic qualities could be achievable via the careful specification of materials via the PMD editor, using the correct shaders and correction effects plus careful adjustment of the global light source tweaked with these controllers. So the net effect is a greater degree of realism or more realistic renderings. Although, to be honest I don't think you will be able to get the same results as from Poser, but something very close should be possible.

Download
The effect was written by Elle-P and can be downloaded from: ux.getuploader.com/Elle_DataPo…

Description
Although I am using the standard format for explaining this effect, there are somethings you need to know which are not so easily illustrated. So the text here will cover the omissions. I will try to keep it brief.

The Sliders
Both controllers use the same type of sliders. Briefly this is what they do, but important to keep in mind that the sliders are complimentary in the sense that they effect each other as well as the effects of the other sliders but to a lesser extent.

The controllers have a huge effect on the behavior of the global lighting set up, so set this up first before tweaking with the sliders.

Also make sure you turn on: view(V) > camera lighting tracking (C).

MainLight +/- : these sliders affect the behavior of the primary global lighting. Primarily their intensity and tones.
GroundRef +/- : these sliders control the way the ground plane interacts with light cast on it. It is most noticable of the ground plane, but it actually controls the light thrown back from the ground plane on to other surfaces, primarily on the MMD model.
RimLight +/- : these sliders control how light "curves" over the edges of the MMD models. Especially useful for backlighting control or when the primary lighting is coming off the ground plane.
LightEdge + : the effect of this slider is situational. Very often you won't see any immediate apparent result. Mainly a highlighter.
AmbientEdge + : this slider controls how the light from surrounding objects interact with other objects in the vicinity. As it's name implies the visual result is most noticable around the edge of objects.

Use and Considerations
The controllers are loaded as PMD models. Their actually location in 3D space is irrelevant as the direction of their effects are controlled via MMD's global light settings.

These effects are fairly system intensive. They can really bog down a slow system.

There are two controllers:
Post OverRayVR.pmd
Post GammaLightVR.pmd

For most applications you will only need the first one. The second one is used to correct or adjust colors and tones set by the first one. According to the instructions, however, it can also be used as a light source coming from the opposite direction.

The controllers can be used by themselves to emulate the effects of other MMD shaders.

Understanding how the lighting system works in MMD and why these controllers are useful
I can only this briefly as the subject is actually quite complex. MMD's light system factors in only light from the global light source and reflects this directly to the camera. When the light hits an object it factors in the properties of its material as set by its diffuse, ambient, specular, transparency and shininess values. These can also be offset/adjusted through the use of tone, sph and spa maps. The system in place is sophisticated and primitive at the same time. So for example, you cannot have a truly luminous material without the use of an MME effect, but it does a fairly good job representing dull to shiny materials through a combination of the aforementioned.

What MMD does not do is factor in light reflected from other materials on to the object or model. This is the primary reason why MMD cannot produce photorealistic results (like Poser could for example). Software like Poser uses as system that is called Ray Tracing and in a nutshell, this allows for the program to calculate how light interacts with a model from all sources in a scene. Naturally, this is pretty system intensive and this is probably why MMD doesn't have it as it's really made for making music videos on your average home computer system.

The Post OverRay effect fills this void by virtually simulating a Ray Tracing environment, and this is one of the reasons why it works so well with other shaders as it makes up for their primary short-coming. Specifically, almost all MME shaders do not factor in light sources from any source other than the global light source.

But the Post OverRay effect also factors in the characteristics of materials in models, so once again for those who understand how the material specifications really work, in theory almost photographic qualities could be achievable via the careful specification of materials via the PMD editor, using the correct shaders and correction effects plus careful adjustment of the global light source tweaked with these controllers. So the net effect is a greater degree of realism or more realistic renderings. Although, to be honest I don't think you will be able to get the same results as from Poser, but something very close should be possible.

Download
The effect was written by Elle-P and can be downloaded from: ux.getuploader.com/Elle_DataPo…